import datetime
import time

# 日期时间字符串
st = "2017-11-23 16:10:10"
# 当前日期时间
dt = datetime.datetime.now()
# 当前时间戳
sp = time.time()

# 1.把datetime转成字符串
def datetime_toString(dt):
    #print("1.把datetime转成字符串: ", dt.strftime("%Y-%m-%d %H:%M:%S"))
    return dt.strftime("%Y-%m-%d %H:%M:%S")


# 2.把字符串转成datetime
def string_toDatetime(st):
    #print("2.把字符串转成datetime: ", datetime.datetime.strptime(st, "%Y-%m-%d %H:%M:%S"))
    return datetime.datetime.strptime(st, "%Y-%m-%d %H:%M:%S")


# 3.把字符串转成时间戳形式
def string_toTimestamp(st):
    #print("3.把字符串转成时间戳形式:", time.mktime(time.strptime(st, "%Y-%m-%d %H:%M:%S")))
    return time.mktime(time.strptime(st, "%Y-%m-%d %H:%M:%S"))


# 4.把时间戳转成字符串形式
def timestamp_toString(sp):
    #print("4.把时间戳转成字符串形式: ", time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(sp)))
    return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(sp))


# 5.把datetime类型转外时间戳形式
def datetime_toTimestamp(dt):
    #print("5.把datetime类型转外时间戳形式:", time.mktime(dt.timetuple()))
    return time.mktime(dt.timetuple())
